// download.js v4.2, by dandavis; 2008-2016. [CCBY2] see http://danml.com/download.html for tests/usage
// v1 landed a FF+Chrome compat way of downloading strings to local un-named files, upgraded to use a hidden frame and optional mime
// v2 added named files via a[download], msSaveBlob, IE (10+) support, and window.URL support for larger+faster saves than dataURLs
// v3 added dataURL and Blob Input, bind-toggle arity, and legacy dataURL fallback was improved with force-download mime and base64 support. 3.1 improved safari handling.
// v4 adds AMD/UMD, commonJS, and plain browser support
// v4.1 adds url download capability via solo URL argument (same domain/CORS only)
// v4.2 adds semantic variable names, long (over 2MB) dataURL support, and hidden by default temp anchors
// https://github.com/rndme/download

;(function (root, factory) {
  // eslint-disable-next-line no-undef
  if (typeof define === "function" && define.amd) {
    // AMD. Register as an anonymous module.
    // eslint-disable-next-line no-undef
    define([], factory)
  } else if (typeof exports === "object") {
    // Node. Does not work with strict CommonJS, but
    // only CommonJS-like environments that support module.exports,
    // like Node.
    module.exports = factory()
  } else {
    // Browser globals (root is window)
    root.download = factory()
  }
})(this, function () {
  return function download(data, strFileName, strMimeType) {
    var self = window // this script is only for browsers anyway...
    var defaultMime = "application/octet-stream" // this default mime also triggers iframe downloads
    var mimeType = strMimeType || defaultMime
    var payload = data
    var url = !strFileName && !strMimeType && payload
    var anchor = document.createElement("a")
    var toString = function (a) {
      return String(a)
    }
    var myBlob = self.Blob || self.MozBlob || self.WebKitBlob || toString
    var fileName = strFileName || "download"
    var blob
    var reader
    myBlob = myBlob.call ? myBlob.bind(self) : Blob

    if (String(this) === "true") {
      // reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback
      payload = [payload, mimeType]
      mimeType = payload[0]
      payload = payload[1]
    }

    if (url && url.length < 2048) {
      // if no filename and no mime, assume a url was passed as the only argument
      fileName = url.split("/").pop().split("?")[0]
      anchor.href = url // assign href prop to temp anchor
      if (anchor.href.indexOf(url) !== -1) {
        // if the browser determines that it's a potentially valid url path:
        var ajax = new XMLHttpRequest()
        ajax.open("GET", url, true)
        ajax.responseType = "blob"
        ajax.onload = function (e) {
          download(e.target.response, fileName, defaultMime)
        }
        setTimeout(function () {
          ajax.send()
        }, 0) // allows setting custom ajax headers using the return:
        return ajax
      } // end if valid url?
    } // end if url?

    // go ahead and download dataURLs right away
    if (/^data\:[\w+\-]+\/[\w+\-]+[,;]/.test(payload)) {
      if (payload.length > 1024 * 1024 * 1.999 && myBlob !== toString) {
        payload = dataUrlToBlob(payload)
        mimeType = payload.type || defaultMime
      } else {
        return navigator.msSaveBlob // IE10 can't do a[download], only Blobs:
          ? navigator.msSaveBlob(dataUrlToBlob(payload), fileName)
          : saver(payload) // everyone else can save dataURLs un-processed
      }
    } // end if dataURL passed?

    blob =
      payload instanceof myBlob
        ? payload
        : // eslint-disable-next-line new-cap
          new myBlob([payload], { type: mimeType })

    function dataUrlToBlob(strUrl) {
      var parts = strUrl.split(/[:;,]/)
      var type = parts[1]
      var decoder = parts[2] === "base64" ? atob : decodeURIComponent
      var binData = decoder(parts.pop())
      var mx = binData.length
      var i = 0
      var uiArr = new Uint8Array(mx)

      for (i; i < mx; ++i) uiArr[i] = binData.charCodeAt(i)

      // eslint-disable-next-line new-cap
      return new myBlob([uiArr], { type: type })
    }

    function saver(url, winMode) {
      if ("download" in anchor) {
        // html5 A[download]
        anchor.href = url
        anchor.setAttribute("download", fileName)
        anchor.className = "download-js-link"
        anchor.innerHTML = "downloading..."
        anchor.style.display = "none"
        document.body.appendChild(anchor)
        setTimeout(function () {
          anchor.click()
          document.body.removeChild(anchor)
          if (winMode === true) {
            setTimeout(function () {
              self.URL.revokeObjectURL(anchor.href)
            }, 250)
          }
        }, 66)
        return true
      }

      // handle non-a[download] safari as best we can:
      if (/(Version)\/(\d+)\.(\d+)(?:\.(\d+))?.*Safari\//.test(navigator.userAgent)) {
        url = url.replace(/^data:([\w\/\-\+]+)/, defaultMime)
        if (!window.open(url)) {
          // popup blocked, offer direct download:
          if (confirm("Displaying New Document\n\nUse Save As... to download, then click back to return to this page.")) {
            location.href = url
          }
        }
        return true
      }

      // do iframe dataURL download (old ch+FF):
      var f = document.createElement("iframe")
      document.body.appendChild(f)

      if (!winMode) {
        // force a mime that will download:
        url = "data:" + url.replace(/^data:([\w\/\-\+]+)/, defaultMime)
      }
      f.src = url
      setTimeout(function () {
        document.body.removeChild(f)
      }, 333)
    } // end saver

    if (navigator.msSaveBlob) {
      // IE10+ : (has Blob, but not a[download] or URL)
      return navigator.msSaveBlob(blob, fileName)
    }

    if (self.URL) {
      // simple fast and modern way using Blob and URL:
      saver(self.URL.createObjectURL(blob), true)
    } else {
      // handle non-Blob()+non-URL browsers:
      if (typeof blob === "string" || blob.constructor === toString) {
        try {
          return saver("data:" + mimeType + ";base64," + self.btoa(blob))
        } catch (y) {
          return saver("data:" + mimeType + "," + encodeURIComponent(blob))
        }
      }

      // Blob but not URL support:
      reader = new FileReader()
      reader.onload = function (e) {
        saver(this.result)
      }
      reader.readAsDataURL(blob)
    }
    return true
  } /* end download() */
})
